I've owned the USP (9mm and 40), USP-C (45), HK45C, HK45, VP9, P2000, and P30. All were DA/SA except the latter two, which were "V4" LEMs. My observations, based on shooting all of them quite a bit:
HKs are the "gold standard" for reliability for a reason. Accuracy tends to be good to great, despite "meh" or worse triggers. I never warmed up to the LEM, even though I ran one exclusively and trained hard with it for about 18 months. Night sight options are limited for all but the P30/HK45 dovetails.
Were I in the market for a DA/SA pistol right now, it would be the CZ P07. It's size equivalent with the P2000 with more capacity, a better trigger out of the box, and equivalent accuracy (in my experience).
If you're dead set on HKs, in 9mm I'd go for the P2000 (I strongly prefer the rear slide decocker vs the multi-use safety/decock lever of the USP), then the USPc. In 45, I slightly favor the USP-C for trigger reasons, though, again, I don't care for the safety/decock lever, personally.